engleski

Enhanced Contingency Analysis—A Power System Operator Tool

Contingency analysis (CA) is a well-known function in power system planning andoperation. In accordance with CA results, the system operator dispenses information regardingstatic security of the power system (overloads and/or voltage outside tolerable limits). However, classic CA with remedial action schemes cannot distinguish safe operating regimes from potentiallydangerous ones in terms of voltage (in)stability. In fact, voltage instability is considered as one of themajor threats leading to power system insecurity. Therefore, in this study an enhanced contingencyanalysis (ECA) is presented where the classical CA is extended with static voltage analysis based onthe modal analysis. The article presents a dedicated methodology for the proposed ECA tool, withspecial emphasis on the analysis of corrective measures provided by the system operator, intendedfor enhancing power system security (regulation transformer action, distributed generation andenergy storage). Also the influence of the load model was analyzed by simulation and the mainconclusions are presented. The study demonstrated the advantages that distributed generationresources and energy storage can provide in the context of voltage stability. Also, the simulationsacknowledged the importance of correct load modeling, since over or under estimation of a certainload-type component can result in too optimistic or too pessimistic power system operation limits.

contingency analysis ; voltage stability ; modal analysis ; distributed generation ; energy storage ; electric load model

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